Ice Machine Troubleshooting Chart - Follett 12 Installation, Operation And Service Manual

Ice machine troubleshooting
Flashing water LED at any time indicates that water signal to board had been lost for more than one second.
Ten-second delay: There is a 10 second delay in reaction to loss of water (WTR) or bin (B-E) signals. If signals
are not lost for more than 10 seconds, no reaction will occur.
Problem Indicators
Ice machine will not 1. No power to unit.
run.
2. Open bin level control.
System status:
3. Water OK LED (WTR) not on.
compressor,
4. 20M or 2ND LED is on indicating that fi rst or
gearmotor, and fan
second torque error has occurred.
motor inoperative.
5. Gear motor locked up (immediate torque error
indicated by LEDs when board is reset).
6. Open coil on gearmotor start relay causing an
immediate torque error.
Compressor will not 1. Condenser coil plugged causing open overload or
run. high pressure cut-out.
2. Defective starting capacitor.
System status:
gearmotor and fan
3. Defective starting relay.
motor run.
4. Open motor winding.
5. No power output from compressor output terminal
on control board.
Unit cycles 1. Float reservoir running dry, sensing probe
intermittently. signalling for system to shut down.
System status:
compressor, gearmotor,
and fan motor cycle.
Low ice production. 1. Dirty air fi lter or condenser coil.
2. Restricted air fl ow to condenser coil.
Poor quality ice.
3. Mineral coated evaporator.
4. Improper exhaust air provisions.
5. Faulty expansion valve.
6. Low refrigerant charge.
7. Superheat incorrect.
8. Inefficient compressor.
Water leaks 1. O ring seal broken.
from bottom of
evaporator.
Ice machine runs for 1. Kink in ice transport tube.
short period of time
2. Bin level control remains in closed position.
and shuts down on
3. Ice transport tube ruptured internally.
torque error.
4. Worn evaporator bearings.
System status: 20M or
2nd LED is lit.
5. Faulty gearmotor start relay. Ice machine torques
out within 5 seconds of start-up.
6. Torque out occurs when storage bin fi lls to capacity.
Evaporator is iced up 1. Gearmotor running but no output rotation.
on the outside. No ice
2. Float reservoir empty.
production.
3. Air bubble in water supply line. Water
System status:
in reservoir but not in evaporator.
compressor, gearmotor
and fan motor running.
12CI400A • 12HI400A
Corrective Action
1. Check that unit is plugged in, circuit breakers are on.
2. Adjust or replace ice level control.
3. Check reservoir for water, restore water to unit.
4. See #6 below.
5. Repair or replace gearmotor.
6. Replace gearmotor start relay.
1. Clean condenser coil and replace overload if
necessary.
2. Replace start capacitor.
3. Replace relay.
4. Ohm out windings and replace compressor if
necessary.
5. Check terminal connection and replace control board
if necessary.
1. Check water supply to fl oat and fl oat operation. PC
board will have fl ashing WTR LED.
1. Clean or replace fi lter, clean condenser.
2. Remove obstruction.
3. Clean evaporator.
4. Provide proper exhaust air provisions per Follett
installation manual.
5. Replace expansion valve.
6. Check for leaks; repair, evacuate, and weigh in correct
charge.
7. Check that TXV sensing bulb is securely clamped in
place and not damaged; check that insulated bulb
cover is in place.
8. Replace compressor.
1. Replace O ring.
1. Eliminate kink and check that tube routing complies
with Follett ice machine installation manual.
2. Adjust or replace control.
3. Replace complete length of ice transport tube.
4. Inspect bearings for roughness or binding and replace
if necessary.
5. Replace gearmotor start relay.
6. Ensure that ice contacts bin thermostat before
backing ice up in transport tube. Refer to dispenser
manual for proper thermostat and ice tube mounting.
1. Check for broken gearmotor output shaft or damaged
gearbox.
2. Check for defective water sensor (water OK (WTR)
LED remains on even when fl oat empty or probe
removed from water).
3. Purge air from line.
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